It all starts with the foolish pranks of the son. He makes slits in his mother's panties, causing them to rip when she bends over, or steals her clothes while she's bathing and hides them, acting like a child. At first, the mother just rolls her eyes at his childish antics. However, the pranks gradually escalate, turning sexual as he starts to molest her while she's sleeping or exposes his cock during chores.